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Can someone please help me get this actually onto wikipedia rather than a sandbox page? My final grade depends on this and nothing I try is working. Thank you! T0rqu3b0t ( talk) 00:43, 14 December 2015 (UTC)T0rqu3b0t reply

In the lede, the text says that "the basic chronology ... is divided into 7 different periods", and it then goes on to define periods I through V and "the final period", which only gives six. So it is quite unclear whether there are six or seven periods. I do not have access to the cited text to check.-- Gronk Oz ( talk) 07:02, 14 December 2015 (UTC) reply